Cumulative Sums, Products, and Extremes
Cumulative Sums, Products, and Extremes
## S3 method for class 'ff' cumsum(x, ...) ## S3 method for class 'ff' cumprod(x, ...) ## S3 method for class 'ff' cummax(x, ...) ## S3 method for class 'ff' cummin(x, ...)
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An ff vector of the same length and type as x (after coercion), except that cumprod returns a numeric vector for integer input.
An NA value in x causes the corresponding and following elements of the return value to be NA, as does integer overflow in cumsum (with a warning).
x <- 1:10000 tmp <- cumsum(ff(x)) class(tmp) table(tmp[] == cumsum(x)) x <- rnorm(1000) tmp <- cummax(ff(x)) table(tmp[] == cummax(x)) tmp <- cummin(ff(x)) table(tmp[] == cummin(x)) tmp <- cumprod(ff(x)) table(tmp[] == cumprod(x)) ## S3 type of calling cumsum(ff(x)) cummax(ff(x)) cummin(ff(x)) cumprod(ff(x))
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